Fix #62, an off by one error made it impossible to deal with escape c…

…haracters at the beginning of a string

.pre-commit-config.yaml

@@ -7,7 +7,7 @@ repos:
   - id: mixed-line-ending
   - id: end-of-file-fixer
 - repo: https://github.com/pycqa/flake8
-  rev: 7.1.0
+  rev: 7.1.1
   hooks:
     - id: flake8
       args: ["--extend-ignore=E203,E501", "--per-file-ignores=__init__.py:F401"]
@@ -17,7 +17,7 @@ repos:
     - id: bandit
       args: [ --exclude, tests ]
 - repo: https://github.com/psf/black
-  rev: 24.4.2
+  rev: 24.8.0
   hooks:
     - id: black
 #- repo: https://github.com/pre-commit/mirrors-mypy/

pyproject.toml

@@ -3,7 +3,7 @@ requires = ["setuptools>=61.0"]
 build-backend = "setuptools.build_meta"
 [project]
 name = "json_repair"
-version = "0.27.0"
+version = "0.27.1"
 license = {file = "LICENSE"}
 authors = [
   { name="Stefano Baccianella", email="4247706+mangiucugna@users.noreply.github.com" },

src/json_repair/json_repair.py

@@ -412,7 +412,7 @@ def parse_string(self) -> Union[str, JSONReturnType]:
             string_acc += char
             self.index += 1
             char = self.get_char_at()
-            if len(string_acc) > 1 and string_acc[-1] == "\\":
+            if len(string_acc) > 0 and string_acc[-1] == "\\":
                 # This is a special case, if people use real strings this might happen
                 self.log("Found a stray escape sequence, normalizing it", "info")
                 string_acc = string_acc[:-1]

tests/test_json_repair.py

@@ -97,6 +97,7 @@ def test_missing_and_mixed_quotes():
     assert repair_json('[{"key": "value", COMMENT "notes": "lorem "ipsum", sic."}]') == '[{"key": "value", "notes": "lorem \\"ipsum\\", sic."}]'
     assert repair_json('{"key": ""value"}') == '{"key": "value"}'
     assert repair_json('{"key": "value", 5: "value"}') == '{"key": "value", "5": "value"}'
+    assert repair_json('{"foo": "\\"bar\\""') == '{"foo": "\\"bar\\""}'
 
 def test_array_edge_cases():
     assert repair_json("[1, 2, 3,") == "[1, 2, 3]"